{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"1.5KE91ARL4G","brand":"Littelfuse Inc.","brandSlug":"littelfuse-inc","productSlug":"1.5KE91ARL4G","canonicalUrl":"https://icboms.com/littelfuse-inc/1.5KE91ARL4G","factsUrl":"https://icboms.com/api/mcp/products/1.5KE91ARL4G","rawCanonicalId":null},"summary":{"shortDescription":"Littelfuse Inc. Mosorb™ series Zener TVS diode, 1.5KE91ARL4G, 1500W peak pulse power, 77.8V reverse standoff, 125V clamping, 12A peak pulse current, DO-201AD axial, through hole.","salesMarkdown":"## Zener TVS diode — 1.5 kW peak pulse, 77.8 V standoff The 1.5KE91ARL4G: Clamping is specified at 125 V maximum at the 12 A peak pulse current (10/1000 µs waveform), so a 77.8 V nominal bus sees the surge energy absorbed before the voltage spike reaches the 125 V ceiling. The single unidirectional channel handles one polarity; for AC or bidirectional lines a different part is needed. ## Thermal and package constraints for the BOM Operating junction temperature spans -65 °C to 175 °C, covering military and industrial extremes. The DO-201AD axial package (through-hole) requires a lead-formed footprint on the PCB — the body diameter and lead spacing match standard 0.100-inch pitch layouts. Power line protection is not supported (the part lacks the bidirectional or low-capacitance structure needed for high-speed data lines). It is a bulk transient suppressor for power inputs, relay coils, or DC motor terminals where the 10/1000 µs waveform represents the typical surge from inductive kickback or lightning-coupled energy. ## Obsolete — sourcing through independent channels Littelfuse has marked the 1.5KE91ARL4G as obsolete. The Mosorb™ series covers a wide voltage range in the same DO-201AD footprint. A functionally similar Zener TVS with the same standoff voltage and package can be cross-referenced, but no pin-compatible direct replacement from Littelfuse is documented. A board-level qualification is advised before substituting.","metaTitle":"Littelfuse 1.5KE91ARL4G Mosorb Zener TVS, 1.5kW, 77.8V","metaDescription":"Littelfuse 1.5KE91ARL4G Mosorb Zener TVS diode, 1500W peak pulse, 77.8V standoff, DO-201AD. Obsolete — sourced to order against RFQ. Clamping at 125V.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Obsolete","categoryPath":["Circuit Protection"],"specifications":{"Mfr":"Littelfuse Inc.","Type":"Zener","Series":"Mosorb™","Package":"Tape & Reel (TR)","Applications":"General Purpose","Mounting Type":"Through Hole","Package / Case":"DO-201AD, Axial","Product Status":"Obsolete","lifecycle_stage":"unknown","Power - Peak Pulse":"1500W (1.5kW)","Base Product Number":"1.5KE","Operating Temperature":"-65°C~175°C(TJ)","Power Line Protection":"No","Capacitance @ Frequency":"-","Supplier Device Package":"Axial","Unidirectional Channels":"1","Voltage - Breakdown (Min)":"86.5V","Voltage - Clamping (Max) @ Ipp":"125V","Voltage - Reverse Standoff (Typ)":"77.8V","Current - Peak Pulse (10/1000µs)":"12A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.1800","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/b2bad05ac2a782d44789dbfb00c46ecc.pdf","sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/littelfuse-inc/1.5KE91ARL4G","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/littelfuse-inc/1.5KE91ARL4G when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:34:45.345Z","lastPublished":"2026-07-20T14:34:45.345Z","indexable":true}}